correct hammer for NPM 4,245xxx

[RCS]

Not certain what the correct hammer should be in this carbine as I have had it a number of years. The hammer in this carbine now is a late I H

Barrel is IBM CORP front sight SN
slide is heart cut UN Flat bolt blued N14 trigger housing N8 push safety NS

Mag catch MN - might be incorrect ? sear LN Rear sight S

single rivet handguard TN recoil plate LN

stock is hi-wood TRIMBLE TN in oval cut cartouche is NPM over FJA next to crossed cannon

Information

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[c-j]

IBM used only type 3 hammers
marked WMB-GMB-AMB

Bolt should be round

March/April of 44. The round bolt (type III) came in around serial number:
Inland 5 mil
Win 5.6 mil
Underwood 6.1 mil
Rock 4.6 mil
Qhmc 4.65 mil
SG 5.84 mil
Npm 4.4 mil
Ibm 3.9 mil
IP,S'G' and Stan Pro- no use

[Rustship]

Flat Bolt is correct for NPM 4.24, MN mag catch is correct. Hammer would be NH

[tenOC]

What type of hammer?

[ChipS]

3. HN. Welcome. (I win)

[RCS]

Thank you for the data. Forgot to list the front band is the early Type 1 with three small tack welds and unmarked, the swivel is stamped U I