Registered mortice chisels not square.

[David C]

I have a 1/16" chisel which looks very similar.

It has that arrow and a number. MOD or GPO ?

Very useful occasionally, though I prefer the Japanese version which has an appropriate length of blade, i.e. much shorter.

They are both of parallelogram section which is irritating.

David

 

[swb58]

[/quote]Might be a Sash Pocket Chisel, used in cutting the slots to feed the weights through in sash frames. They tend to be wide, but with very thin blades. Here's one - https://www.pinterest.com/pin/393642823654355334/[/quote]

It's not one of those. I'll get a photo and post in a new thread, don't want to hijack this one. Cheers.