54163 made in 1956. This is from Ruger's web site.
ruger.com
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10/22 Magnum Rifle
10/22 Rifle
22/45 Pistol
44 Carbine Rifle
77/22 & 77/17 Rifle
77/22 Hornet Rifle
77/44 Rifle
77/50 Muzzleloader
Bearcat & Super Bearcat Revolver
Blackhawk Revolver
GP100 Revolver
Hawkeye Single-Shot Pistol
M77 - Original Tang Safety Model Rifle
M77 Mark II Deluxe / Express Rifle
M77 Mark II Magnum Rifle
M77 Mark II Rifle
Mark II Pistol
Mini Thirty Rifle
Mini-14 Ranch Rifle
Mini-14 Rifle
Model 96 - 96/22 and 96/17 Rifle
Model 96 - 96/44 Rifle
New Bearcat Revolver
New Model Blackhawk Revolver
New Model Blackhawk S3840 Special Model Revolver
New Model Single-Six
New Model Single-Six - SSM Revolver
New Model Single-Six Colorado Centennial Revolver
New Model Single-Six S32X Special Model Revolver
New Model Super Blackhawk Hunter Revolver
New Model Super Blackhawk Revolver
No. 1 Single-Shot Rifle
No. 3 Single-Shot Rifle
Old Army Cap & Ball Blued Model - BP Revolver
Old Army Cap & Ball Stainless Model - KBP Revolver
P-Series - P85 - P85MKII Pistol
P-Series - P89 Manual Safety Model Pistol
P-Series - P89D Decocker Model Pistol
P-Series - P89DAO Double-Action Only Model Pistol
P-Series - P90 Manual Safety Model
P-Series - P90D Decocker Model Pistol
P-Series - P91D Decocker Model Pistol
P-Series - P91DAO Double-Action Only Model Pistol
P-Series - P93D Decocker Model Pistol
P-Series - P93DAO Double-Action Only Model Pistol
P-Series - P94 Manual Safety Model Pistol
P-Series - P944 - Manual Safety Model Pistol
P-Series - P944D Decocker Model Pistol
P-Series - P944DAO Double-Action Only Model Pistol
P-Series - P94D Decocker Model Pistol
P-Series - P94DAO Double-Action Only Model Pistol
P-Series - P95D Decocker Model Pistol
P-Series - P95DAO Double-Action Only Model Pistol
P-Series - P97D Decocker Model Pistol
P-Series - P97DAO Double-Action Only Model Pistol
Red Label Over-and-Under Shotgun
Redhawk Revolver
Ruger PC4 Carbine Rifle
Ruger PC9 Carbine Rifle
Security-Six, Speed-Six, Police Service-Six Revolver
Single-Six Lightweight Model Revolver
Single-Six Magnum Model Revolver
Single-Six Standard Model Revolver
SP101 Revolver
Standard & Mark I Pistol
Super Blackhawk Revolver
Super Redhawk Revolver
Super Single-Six Revolver
Vaquero Revolver
Woodside Over-and-Under Shotgun