Hawes SAs were well regarded back in the day.
At the time they were produced, Germans had made a fetish out of the American West and were in love with all things Cowboy and Indian. American westerns were extremely popular in theaters and on television. Of course, German appreciation for American western lore predated WWII by decades, but the plethora of 50's & 60's Western films (along with a magnanimous US occupational presence), drew loads of German fans looking to "cowboy up" on the weekends.
At that time, many Deutschers willingly spent their paychecks on period clothing and weapons, even taking their annual vacations at Western Re-enactment Camps. It was like Cowboy Action Shooting meets Western Theme Park for some devotees. Really a huge cultural buy-in for a mythical "Wild West".
There was a demand for affordable Single Action Army's (back at a time when the $ - DM exchange rate was around 4 to 1). Colts weren't that available in Europe and were pricey when found.
Enter market brands like Hawes (Sauer & Sohn). Although the Italian gun makers eventually came to dominate the market, for a time, some of the better quality West German cowboy guns were popular on both sides of the pond.
Image of Hawes Western Marshall from
www.gunblast.com:
http://en.wikipedia.org/wiki/Old_Shatterhand