I suppose I can help you out with the manufacture date.
When you look at the serial number of your Glock, you'll find two (or three) letters, then three numerals, and then a three-letter-code.
In case of my Glock (born&raised in Austria) that's MB XXX LDO, which translates to a manufacture date of February '90.
The first letter is for the month:
E...Jan
L...Feb
N...Mar
B...Apr
S...May
Z...Jun
G...Jul
P...Aug
I...Sep
C...Oct
V...Nov
A...Dec
The last two letters are for the year:
O...0
W...1
K...2
R...3
F...4
M...5
H...6
Y...7
T...8
D...9
So 'LDO' means Feb 90, for instance 'SDM' would mean May 95.
I believe I read somewhere that Glocks either manufactured in or exported to the U.S. have a 'U.S.' stamped somewhere, though I haven't seen one of those yet.
Greetings from Austria,
RITM