There are a lot more of these in circulation Nick, Roly has also got one.
And an other showed also up today.
They where a late attempt by Bing to get foot into the metal construction kits.
Keep an eye open they now and than turn up for auction…
…strange is, that they are not so loved by German collectors.
Yes Danny, I know the 10/147 is common, but mine is a 10/148 (twin cylinder). I have not seen another, Oliv says he has one in the attic and mine is the only other he has seen

more here:
https://www.officeofsteamforum.com/collections-pictures/bing-10148/msg16697/#msg16697