1943 Savage Unit Disk Question

[MilitaryTorch]

My first post here.
I just got a 1943 N4 MK1* all matching rifle with a unit disk that reads B A 135
I have searched the internet trying to identify it with no luck.

The rifle is mint, all matching, no import mark and I am trying to see if it ever left the country, hopefully the unit disk will provide some answers.

Thank you

Information

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[gsimmons]

Please post a picture. No4's didn't normally have unit discs

[MilitaryTorch]

I will tonight.
as far as the unit disk goes, is there a reference that might identify what BA 135 stands for?

[MilitaryTorch]

Pictures added, what do you think?

About the unit disk, it says BA 315 and the buttplate has 315 number on it as well.