car radio module identification/datasheet?

hi,

i extracted this radio module from an old car radio. the problem is its has no identification marks/tags on its case just some production markings (may be)... it contains only 2 chips ..one is LA1137 which is AM tuner from Sanyo... other is AJ21K whose datasheet i could not find on internet.

i believe it is complete radio receiver module ... is there any resource where i can get the datasheet/pinout description for this WHOLE module.. ?

is this module is a vendor specific design for car radio or other manufacturers also have these kind of modules?

plz check attached pics..!