A search of the 1983 IC master says yes, this is an RCA part...
it is described as a "7 watt audio power amplifier"
Possible other sources are ST (SGS-Thomson) and Hitachi.
Look for their part TBA810.  The ST data book notes that this part
is Not Recommended For New Designs, but they might still
have some residual stock.

> Hi, does anybody now the manufacturer of this chip: CA810M ? This is an
> audio power amplifier but I don't know who the manufacturer is. I need to
> know so that I can download the datasheets. Thanks. Best Wishes.
>
> That sounds like one of the parts RCA made back in the 1970's.  You might
> find a replacement or data sheet from Harris, unless someone kept their old
> RCA data books.  I have a 1974 book of app notes, but I didn't see that part
> number listed.
>
> Mark Walsh
>