Remington model 14's

[Tom H]

Model 14s were available with an extra cost optional "steel rifle buttplate" for $1.50 beginning with the 1913-14 catalog. This buttplate was a full crescent shape with a top wrap. By 1918, the price for this option was $2.75. Around 1920-21, they began putting such stock-buttplate guns out just to use them up before introduction of the semi crescent buttplate with a bottom wrap that was used until the end of production in 1935. As to wheel sights, they were used on guns up to around 1921-22 and are found, occasionally, on guns made as late as 1933 production.

[nambujim]

Hemphill nailed it for you but when it comes to variations the Model 14 leads the pack in that regards to the point where I keep telling folks "no two are identical". The amazing amount of internal & external variations make them unique and entertaining to collect, shoot, or repair.