Trigger Berg and the Treasure Tree (#1 of 4 in "Trigger Berg" series)

This VG/G+ first format book is likely a first edition: book lists only to Hardy Boys "Cabin Island" (1929) and jacket lists only to Jerry Todd "Bob-tailed Elephant" (1929). Exterior of book is square, reasonably clean, with only very minor bumping at corners and head and heel of spine; there are three tiny points of fabric wear at the top of the front board. Interior is free of marks, stains and page damage; hinges are strong and lightly toned paper is quite flexible; frontis + 3 is intact. The jacket is complete and intact, though there is a water stain on the top 6" of the spine and bleeding red over to the rear panel (see photo). However, the book itself has no evidence of water damage, either on the interior--end pages and text are free of any such damage--and the exterior also shows no evidence of water damage. Perhaps the jacket and book were not original to each other.