I will be very grateful if u could help me to identify there are any rare stamps in this collection. Or any stamps worth more than 50usd? Any kind of help, links, stamp names/numbers in catalogues will be highly appreciated. Also will be thankful for mentioning even the stamps that have to be checked by specialists (in case if u doubt about the number, watermarks etc)
The stamps that might be valuable have very small differences from the common. Your images are too small to be able to make a determination. Plus you need a peroration gauge and watermark detector. But almost everything shown is common.
Cut squares are not too valuable (there are a few exceptions). Cut-to-shape cut squares are worth even less. Cut-into cut squares are essentially junk.