Hi
Only opinion... I tried to read the signature from the third pdf attachment you posted since the imageshack site said no image found. Your signature image truncated to admit only a "J" reading of the first initial. Actually, I think it can be read as a"D" or a "W" . IF you want to post a better signature with margin on four sides please do so.
If it is a "D" then you might look at D. Larkin for three examples of his signature. They don't look enough the same to exclude yours as a possible fourth. See the link:
Diarmuid Larkin on artnet
If it's a "W" then there are at least three, that meet your time frame for when the painting was done, to research further. You can get a starter list by searching artprice.com and then going back to Google or elsewhere. Or we try again with better understanding of the first initial.
Properly you should provide images of the back, any markings, a corner of the canvas stretcher to show staples or nails... Helps better to estimate age and authenticity of the painting. There is always concern if it is a common name that can't be nailed down.
Good luck...