I have several of them in all the calibers,2 are marked 30-30 Remington which is the 30 rem. I have a 435 model sling eyes fancier wood with engraving around the sides of the receiver. The model 440 was fully engraved,i have only seen pictures of it. out of around 300 rifles no one has found a serial number under 1000,or over 6000 ,assume only aroung 5000 rifles made.Don