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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryRotkreuzJohann Keller, Harmonika-Spezialhaus
Johann Keller, Harmonika-Spezialhaus Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company "Akkordeon-Schweiz" (Musikhaus Keller) is a specialty store for hand harmonicas, particularly accordions. The core activities include: * Sales of new accordions from various brands (Record, Scandalli, Pigini, Guerrini, Accordia) * Sales of used accordions (second-hand) * Repair and maintenance of accordions in our own workshop * Sales of accessories for accordions * Personal consulting and services for customers. The company thus offers a comprehensive range of services and products for accordion players and enthusiasts.

AI-generated
Offering

Products & services

✓ Offered5
Accordions
New accordions from well-known manufacturers, including Record, Scandalli, Stradella, Pigini, Guerrini, Accordia and Converter; for different needs and requirements.
Pre-owned instruments
Well-kept pre-owned instruments in excellent condition, including piano, button-grip and diatonic accordions and Schwyzerörgeli; with further reduced pre-owned prices.
Repair service
Repair and restoration of accordions and other instruments with our own workshop, machine room and spare-parts warehouse; spare parts, fingerboards and body parts are partly produced in-house.
Accessories
Accessories for hand harmonicas and accordions as a complementary range in the shop.
Personal consultation
Personal consultation in the shop at Birkenmatt in Rotkreuz for new accordions, accessories and reconditioned pre-owned instruments.
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3.7/5

Johann Keller, Harmonika-Spezialhaus

Trust & reputation

ranQ Trust Score of Johann Keller, Harmonika-Spezialhaus: 3.7 out of 5.0

Trust Score3.7/ 5.0

Solid

x

Data basis 96% · As of October 2026

Johann Keller, Harmonika-Spezialhaus scores 46.9 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.40.424%
  • 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.72.110%
  • 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.35.08%
Johann Keller, Harmonika-Spezialhaus scores 78.5 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.55.07%
Johann Keller, Harmonika-Spezialhaus scores 83.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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).83.322%
Johann Keller, Harmonika-Spezialhaus scores 28.6 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 35.28.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Johann Keller, Harmonika-Spezialhaus reaches a ranQ Trust Score of 3.7 out of 5.0 — rated «Solid». The rating draws, among other things, on 3.5 out of 5 stars from 16 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

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

Reviews

Aggregated rating

Aggregated rating
3.5
of 5

Aggregated from 16 reviews across all connected sources

Sources
GGoogle3.516
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Birkenmatt 3
6343 Rotkreuz
Opening hours
Mon
Closed
Tue
14:00 - 18:30
Wed
14:00 - 18:30
Thu
14:00 - 18:30
Fri
14:00 - 18:30
Sat
09:00 - 12:00
Sun
Closed

At a glance

Legal form
Sole proprietorship
UID
CHE-100.887.580
Founded
1995 · 31 years
Last commercial register change
April 22, 2022
Employees
1 to 10
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.67.06%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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