This is one of the less common designs (at least don't appear for sale that often), but your number looks like one of the newer bits (originally numbered LS 544 and 545) - Planetglass had the taller one (22.5 cm tall) for sale in 2004 for $1200 - don't know if it sold for that price though.
If I had to guess, if good condition, and the smaller one, I wouldn't be surprised on Ebay re $300 +, but as Frank points out, it could be anywhere between $75 and $500 depending on demand.
good luck
Gareth