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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,837 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTrade Fair & Event OrganizersZurichSINCONA Swiss International Coin Auction AG
SINCONA Swiss International Coin Auction AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The core activity of Sincona AG is the operation of auctions for coins, banknotes, medals and other numismatic objects. In addition, the company offers further services, such as trading in precious metals, Coin Lending and the rental of Safe Deposit Boxes.

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Products & services

Industry:Trade Fair & Event OrganizersArt & Antique Trade
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SINCONA Swiss International Coin Auction AG

✓ Offered10
Numismatic auctions
International in-room auctions for coins, medals, banknotes and phaleristic objects; with printed catalogues, online live bidding and consignments of single items or entire collections.
Direct buying and selling of numismatic objects
Buying and selling coins, medals, banknotes as well as orders and decorations from Switzerland and worldwide; including personal advice and confidential valuation.
Expert reports and appraisals
Valuations, expert reports and appraisals for numismatic and phaleristic objects, e.g. for sale, estate division or tax purposes; also confidential appraisals.
Swiss coins and medals
Buying and selling Swiss coins and medals, from Celtic issues to more recent Swiss monetary history.
World coins and medals
Buying and selling world coins and medals from modern times; with a focus on international mintings and numismatic objects.
Ancient coins
Buying and selling ancient coins, from the Lydian period to the Byzantine Empire; including Greek and Roman pieces.
Banknote trading
Buying and selling banknotes; with numismatic classification and integration into auctions as well as direct transactions.
Orders and decorations
Buying and selling orders and decorations, including phaleristic objects and collectors’ items.
Auction catalogues and online auction platform
Printed hardcover catalogues with high-resolution images and precise lot descriptions, as well as participation in live online auctions.
Personal numismatic consulting at trade fairs and events
Personal advice, inspections and acceptance of consignments at numismatic trade fairs and events in Switzerland and internationally.
Trust & reputation

ranQ Trust Score of SINCONA Swiss International Coin Auction AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 100% · As of October 2026

SINCONA Swiss International Coin Auction AG scores 80.9 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.82.024%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.67.110%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.95.08%
SINCONA Swiss International Coin Auction AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.70.07%
SINCONA Swiss International Coin Auction AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
SINCONA Swiss International Coin Auction AG scores 50.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.100.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.0.04%
Qualifications+0.00

SINCONA Swiss International Coin Auction AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.9 out of 5 stars from 13 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.9
of 5

Aggregated from 13 reviews across all connected sources

Sources
GGoogle4.913
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

October 3, 2024Media
Diese Berner Münze ist mit 50'000 Franken noch ein Schnäppchen
20min.ch

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Location

Limmatquai 112
8001 Zurich
Opening hours
Mon
09:00 - 17:00
Tue
09:00 - 17:00
Wed
09:00 - 17:00
Thu
09:00 - 17:00
Fri
09:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-182.566.202
Founded
2011 · 15 years
Last commercial register change
May 23, 2025
Employees
11 to 20
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.100.06%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
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