Best of my knowledge, all Iver Johnson's had serial numbers, In fact it was usually in two places, On the trigger guard and under the left grip. Now this has been posted before but here we go again. If a firearm never had a serial number ( prior to 1968 ) then Merry Christmas. But if it ever had a serial number and it has been removed or defaced then the holder of the firearm is deemed the culprit .. It doesn't matter if the firearm was made prior to 1968 or whenever, IF it ever had a serial number and it has been removed or defaced it is illegal. There there may be ways to rectify the problem, I don't really know. Perhaps if it is a antique the BATEF may issue a new number, again, don't know. One more time, If a firearm was never numbered with a serial number prior to 1968, no problem, however if it had a serial number and it has been removed or defaced, either accidentally or on purpose, regardless of when it was manufactured it is illegal , no grandfather clause in the National Firearms Act of 1934. Now I believe BATFE has better things to do than go after some one with a documented antique, but then again maybe maybe they have another reason to go after you. and will use that for an excuse. Would they do that , Naw, not the BATFE.