My understanding is this is not a Model 21, as we have come to know it. In fact it is the precursor to what became the " 21"/"22"

I will dig out the model desigation and advise. Note this model has no bolt guide.

I do know of one for sale in 7x57, as as well a later square top in 7x57 ( rifle). Please PM if there is any interest. They are very nice rifles. and very under valued.

Best
Eric