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The Model 620 was introduced in 1927 and is a streamlined version of the original 520. The safety was initially located inside the trigger housing just like the Model 520 but by 1929 it had been changed to a cross-bolt located behind the trigger. The stock was attached by a bolt connecting the receiver and trigger tangs through the grip of the ...
Cranks designed to mount three chainrings will almost always use two different bolt circle diameters; the larger to mount the two bigger, outer rings and the smaller to mount the smaller, inner ring. Most modern two-chainring cranks use either a 110 or 130 mm (4.3 or 5.1 in) bolt circle diameter.