Volvo Penta identification please?

Can anyone help identify this inboard - I believe it could be an AQ231A, but unsure. I can't find a plate giving model etc - despite hanging like a bat inside the engine bay! :D

2nd picture shows a number but molded on a part not main block so presumably not a serial? Any idea where serial might be?

Boat is a Fletcher Arrowbolt circa 1980 if that helps.

Thanks in advance.

arrowbolt_PICT0033.JPG


arrowbolt_PICT0010.JPG
Hi
We have same engine but can’t find dipstick! Do you know where it’s located please?
 
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