Giant safety pin? Has a brass number, and i've heard a few things

Vintage Large Industrial Metal Safety Pin Numbered 81

Signature Hardware 953385-KE-LH-238 Aurick Left Handed Solid Brass Keyed Entry Door Lever Set with 2-3/8 Backset Antique Brass Leverset Keyed Entry 479122

I hate to say it but y'all were right. Went to shoot 100 rnds at

Full-Length Sizing for Reliable Precision – Panhandle Precision

Brass-Plated Steel Safety Pins, pack of 125.

Brass Safety Pins Size 1

RELIABILT Gallo Antique Brass Interior Bed/Bath Privacy Door Knob

WEAR A SAFETY PIN: BE AN ALLY, BE KIND, BE A SAFE SPACE

Safety pin - Wikipedia

WEAR A SAFETY PIN: BE AN ALLY, BE KIND, BE A SAFE SPACE

Rare Vintage Huge Brass Safety Pin 5.5 Number 258

Rare Vintage Huge Brass Safety Pin 5.5 Number 258