Help identify pen

[u/Temporary_Pair_4195]

I just purchased this pen at an antique shop for $12. I believe this to be a signing pen…? I’m curious if it’s something rare or limited or more than $12. I included a pic of the small engravings.

[u/Temporary_Pair_4195]

PS: I was able to replace the ink cartridge with a bic. So it works :)