Yes these are Foster Grant.
Alden Reading Glasses for Men | Foster Grant
R: 52 [] 19-140 PD58 5MM +1.00
L: MS0320 Alden BLK
NB: the [] is printed as a 
update: they do not offer +1.00 correction on the web site!?
update: reading the specs online this means the indication on the right is meaning:
52: Lens Width
19: Bridge Size
140: Temple Length
NB: the 3 values above are matching the ruler on my photo!
PD58: I suppose the glasses IPD is 58, I’m 64, but this shall be good when verging for reading and therefore begs the question when used into my headset.
5MM: I’m not sure but could be lens thickness