Here we have the newest pentel pen in my collection. On the left is the Sterling Silver 25th Anniversary Roller Ball. This new pen was commissioned and handed out by the President of Pentel back in 1990 to commemorate 25 years of US Pentel. This one has a serial number of 0610. I would guess that there were 1000 pens made. This is a outstanding roller pen and is clearly the top roller in my collection. This pen has a special refill but can be replaced with the refill for the R-4 which is the next pen. This is one of four R-4s, black, red, green and blue. They use refill number #MG8 . The next pen is the 25th Anniversary Pentel Lancelot which I posted back on 5 October. Last pen on the right is the Pentel Excalibur that I bought back in 1977 at Harrod's of London.