I have been working on this http://www.omnicoin.com/?collection=gm99 I had more coins to add, just started a few days ago. Photos and WHAT THEY ARE,the big thing for me. Enjoy Cheryl
The color on that cu-ni ¥50 seems to be way off. BTW, the aluminum ¥1 is dated Showa 56 (1981), not Showa 46 (1971).
Where are you getting your dates? The ¥5 on page 2 is dated Showa 55 (1980), not Showa 44 (1969). Try photographing your ¥50 against a white background. That might help the white balance of the picture. Edited:I just realized that your dating errors both involve misreading "go" (5) as "yon" (4). Yon is a rectangle with arcs at each of the upper corners. Go is more difficult to describe, but just look at the characters on each side of the "ju" (10 - the one that looks like a "+") on the ¥5.
I've added a comment of using my site to calculate the years: http://www.gxseries.com/numis/asian_yr/asian_yr.htm Alternatively if you are a bummer, here is my typeset and with the year and mintage on them: http://www.gxseries.com/numis/japantype/japantype_current.htm