A study of No.4 Mk.I "Trials" rifles: information requested!

[303 Gunner]

1. Rifle serial number: A1512
2. Date on butt socket: 1931
3. Status: No. 4 Mk I (T)
4. Cocking piece: No. 1 Mk VI Pattern with Cross-Screw
5. Barrel date: 1931
6. Steel Batch Number: None listed
7. Other Marks: Standard butt socket markings. No "TR". England on right side of receiver ring. Caliber stamped on right side of barrel tip.
8. Proofs: Standard military proofs; no civilian ones.
9. Location of proof marks: Underside of barrel, bolt handle, bolt head.
10. Staked: Not staked. Pads look original to rifle.
11. "T" stamp: "T" stamp on left sidewall. Perfect match for my other No. 4 Mk I (T)s.
12. Original Tel. No.: Original scope number obliterated. Probably 1849? 3504 stamped underneath it. Looks period.
13. Maker: Original scope not present.
14. Tel.: Presently fitted with 1941-dated Kershaw No. 32 Mk I No. 7180 in a "KD" marked Rose Brothers bracket