I bought a Topper Model 158 22 Rem Jet here recently have been mostly working at putting componets and load data togeather for it .Don't know why I didn't think about this earlier as far as what yr it is but just being a jet I wanted it.From what I can tell the Jet came about in or around 1961. Looking at my gun it has no visible Ser# but I just found this information in a post of the net on an old forum from 2003 I think. This is the post.
"MODEL 158 COMBO SINGLE SHOT-------------------------------1963-1984
1963-Only Production-Topper-30 & Topper Jet, Side Lever Break Action, Calibers 30-30 Winchester or 22 S&W Jet, 22 inch Barrel, Drill & Tapped for Scope Mount, Pistol Griped Walnut Stained Hardwood stock & Fore-arm, Blade Front Sight, Adjustable Folding Rear Sight, Blue Barrel & Frame Color Case Hardened, Weight 6½ Pounds, Overall Length 37 inches
1964-1967 Production- Topper 4 in 1, Standard with 4 Barrels 1 30-30, 1 22 Jet, 1 410 bore Full Choke and 1 20 gauge Modified Choke
1968-1974 Production- Topper Combo Standard with 2 barrels I 30-30 or 22 jet and 1 20 gauge, Stock is now Straight Griped
1975-Only Production- Topper Combo as above except 22 Jet caliber dropped and 22 Hornet Caliber added
1976-1984 Production- Model 158 Rifle Only, the 20 gauge shotgun barrel dropped only available in 30-30 or 22 Hornet
VALUE: Original Production of a complete set of barrels for the 4 in 1 complete set worth a 100% premium and any 22 Jet Barrel worth a 25% Premium 100%=$225 60%=$125"
What I am trying to do is figure out the yr . Doesn't this frame have to have a ser# on it? By this discription I believe it to be a 1963 model because it is a case color frame. What is on your frames you guys that have the topper158? Also do any of you have a 158 in 22 Hornet with the recessed or contoured bbl?. My Hornet is a 157 not recessed but is the exact same twist 1-16 and bore .221