At the International Exhibition in 1883 at Amsterdam the Schiedmayer Pianofortefabrik [vormals J. & P. Schiedmayer, Stuttgart] was honored with a Honorary Medal.

Details about the Hlavac & Konzertharmoniums are taken from W. Riehm, 3rd edition 1897 (Dutch translation of the 2nd edition 1887). Peer-Konstantin Schober from Germany made me aware of the detailed information on these Concert Harmoniums in a "Lehrbuch Harmonium".

More details to follow!

An peculiar design

In the above details of the Hlavac-Harmonium we see a 8.5 rows instrument. Built with a rich stoplist. Browsing throug the Zeitschrift für Instrumentenbau, Band I (1880-1881) at page 263 I noticed a review of a concert given at Stuttgart by Hlavac. And the full stoplist is mentioned. The image of 1880 is below

Hlavac prototype

The most peculiar properties are 4 'Schöpfer' (meaning feeders) and NO reservoir bellows.

The review is below:

Concert review