1.1" USN Markings ID

Today I got a fired 1.1" USN case.

The headstamp is:

F.S.C.
12-41
[Primer]
1.10 MK. I
75 CAL
[Anchor] R.R.A.

The primer is marked:

MKI9 MOD2 TEI 41#726

The case head has the following ink stampings:

SPDN
3119

Can anyone tell me the manufacturer of the case, primer or who loaded the case from these markings?

Thanks in advance for any info.

Falcon,

F.S.C. is the case manufacturer but I don’t know who that is.
Found only on WWII date naval cases. I hope someone can tell us who this was.

The 85 grams propellant is SPDN. S= Smokeless P= Powder D= Diphenylamine-stabilized N stands for nonhygroscopic.

The 28 grains Mk 19 Mod2 is filled with Army black powder.

Rien