I want to know about my old Amati tuba

[Tommybass]

Hello. If you have any information about the tuba I own, I would like to know.

I bought a used Amati rotary tuba 10 years ago.
There was no information regarding this instrument at the time of purchase, and even when I contacted Amati, I was unable to find out any further details.

In order to share information about the instrument and the information I have researched, I would like to hear from anyone who knows the model, year of manufacture, or any other details, or if anyone has an old catalog. thank you.

◯My tuba information
・"Amati KRASLICE" engraved on the front of the bell
・4 rotary of B pipe
・Silver plating
・“Made in CZECHO SLOVAKIA” engraved on the mouth pipe
・"63566" is engraved on the base that supports the spring of the No. 1 rotary
・"X4" is engraved on the outside of the tube containing the No. 1 rotary

◯Survey results
・Maybe, the model number is ABB481, Model68/L. same as CBB681.
・Maybe, made in Cerveny and sold under the Amati brand
・Since it is not S-linkages, it is thought to be from 1980 or later, but from the name of the country stamped on it, it is thought to be before 1992.

◯What I want to know
・Model
・Manufacturing date or structural characteristics by production year
・Bell engraving history
・Price at that time
・How to read serial numbers
・Characteristics to distinguish product numbers, etc.