I also have a D-25 flat-back, a '71. A LOT of guitar for the money. I bought mine in basically the same shape as the one you describe. Had my luthier take off the busted bridge and carve a replacement. I have $625 total in the guitar, but it will definitely go toe to toe with my more expensive Guilds.
Neal
'65 Mark 1
'71 F-20
'71 D-25
'73 D-35
'74 G-37
'81 D-212
'99 X-150
'00 F-212XL
'11 F-30 Std
'12 F-50 Std
'13 F-47R
'13 Orpheum 12-fret D