"So looks like they were 76-77."
Perhaps there was some overlap in the distribution of the Hawes and Browning. The image of the Hawes P220 (38Super) pictured in the link provided differs from the Hawes P220 (45ACP) I had, largely because of the slide.
I remember the purchase because they, the retailer, gave me the most hassle of any seller, three trips to get just that one P220.
As far as I know it could have been Hawes themselves, at one point I was told it was stuck in customs. And they changed the serial number too.