In article , Gerald Miller
wrote:

Cutter for sealing wax? heat the blade over a candle, cut a thin slice
from the stick and apply to the document and while it is still soft,
imprint it with the owners mark.

I'm thinking it's some sort of harness-maker's tool, but that's a WAG.

--
"The thing about saying the wrong words is that A, I don't notice it, and B,
sometimes orange water gibbon bucket and plastic." -- Mr. Burrows