It appears to be a model 142A which was in production 1949-1957. The earlier ones had the T bolt handle like yours has. The 142A T bolt is not rare but is uncommon. The model number (142A) should be stamped on the barrel. If it is not it has been ground or polished away and reblued. There should also be sling swivels screwed into the left side of the stock. Notice I said side and not bottom. There should also be a S108 peep sight on it. It's hard to really see condition from your pics but the T bolt handle brings a premium over round bolt handle. I just bought a very nice (refinished) 142A T bolt for $200.00. On rimfire central, I see guys have bought average to above average condition 142A's from $200.00-$275.00, mint ones more. Like I said, I can't make out condition very well from your pics but it is missing the peep sight which is about $75-$100.00 on ebay right now to replace. Can't see if it has the side swivels and don't know if the mag is with it. Also don't know if the markings on the barrel have been ground away. It also has someones initials or name on the side which really devalues it. So you could have a $100.00-$125.00 gun if conditions mentioned apply.