I want to say Winchester made that, but the Winchester was Model 37. Your initial suspision is most likely correct; however, the trend of the single-barrel and double-barrel "utility" or 'camp" guns continued well after WWII and into the early 1950's... the existance of a serial number most likely dates it a little later than 1929-1937. It could also be a contract gun (made for a sporting goods or hardware house).