The bottom line Complete European availability and an almost empty specification sheet.
Hands-on testing pending. Everything below is either a manufacturer
specification, cited as such, or something we verified ourselves.
What we verified.B08YN4KBDV designates this machine on amazon.de, .fr,
.it, .es and .co.uk, confirmed on the barcode. It is the only heavy-duty model
in this batch that covers all five European markets including France, which is
the market most often missing. We checked amazon.com and found nothing under
this reference.
What the listings state. The model name and the colour. The German page
gives the full HD6605C designation; the British, Italian and Spanish pages
shorten it to HD6605 and add “electric grey”. No motor rating, no stitch count,
no stitch speed and no weight appears on any of the five.
What we are not going to do. Fill that in from the older Heavy Duty models.
The 4411 publishes a 90 W motor and 1,100 stitches a minute; assuming those
figures carry across to a different model in the same range would be exactly the
kind of quiet invention this site exists to avoid. If the motor rating is what
you are choosing on, Singer’s own product page for the HD6605C states it and
this listing does not.
What we like, and what we don't
Strengths
One reference across every European market we checked, France included
Part of the range Singer builds around a metal internal frame
Compromises
Absent from amazon.com
Almost no specification is published on any of the five listings
Specifications
Type
Heavy duty range
Listed as
HD6605C in Germany, HD6605 in Britain, Italy and Spain
Amazon reference
B08YN4KBDV (five European markets)
Questions people actually ask
Why do the listings call it HD6605 and HD6605C?
The German page uses the full HD6605C designation and the British, Italian and Spanish pages shorten it to HD6605. We confirmed all five on the barcode, so it is one machine under one reference regardless of how each country writes the name. Trailing letters on Singer model numbers usually indicate a colour or a market variant rather than a mechanical difference.
How does this compare with the 4411 and 4423?
It is the same idea in a newer housing: the Heavy Duty proposition is a metal frame, a strong motor and a steel bedplate. What we cannot tell you is whether the internals differ, because these listings publish no motor rating and no stitch speed while the 4411 listings do. That is a gap in the evidence, not a verdict.