He’s not really dead. Well, HE is but his son that took over is not dead. That being said, they are still choteh u’machteh.
Who is this son? He isn’t listed on the internet anywhere (I can’t even find a website for them).
Where does he have semicha from? What is his expertise in kashrus?
Google “David Saffra Nachum Saffra”. Several results down, there’s their site, which is merely a PDF describing their operation.
They are very straightforward, actually, about the idea that their entire appeal is that they don’t charge a lot.
Mashgichim cost money. You get what you pay for.
What is [their] expertise in kashrus?
What is also interesting to note is that in the listing immediately before the one referenced by DY, there is a pdf of their certifications on Dow Corning oils.
There are two certifications, both allegedly by R David Saffra. The signatures are clearly from different people.