There is 1 original Zielcke bassoon in the Hichwa-Rachor database. Very little is known about Zielcke except that he worked in Saint Petersburg, Russia. According to Waterhouse, Zielcke flourished in the second quarter 19th Century. However, in the Sibeliusmuseum archive it states that this bassoon was moved from Turku to Helsinki in 1828 when the University was moved to Helsinki. The instrument was played in a musical society in Turku that was formed in 1790. The bassoon was probably made in the first quarter of 19th Century when Finland was a part of Russia (Finland was annexed by Russia in 1809), therefore, this moves the Zielcke dates to the first quarter of the 19th Century. The only other known Zielcke instrument is an oboe in Bate Collection, Oxford, UK.
Waterhouse, William. The New Langwill Index. London: Tony Bingham, 1993.