Chuck, this photo is definitely from 1961. I definitely know that it is from opening day in 1961. Here is my theory. With the exception of the uniform number between 48 and and 6 which I am unable to ascertain, I have located all of these uniform numbers on the 1961 Reds. There are 24 players that are pictured so therefore one player is not shown. The other years during this time, all of these uniform numbers were not issued.
I looked at the rosters that were in the 1961 World Series and both Jay Hook (47) nor Pete Whisenant (27) did not participate in that World Series so I do no think that this would be from the Series. Furthermore Elio Chacon (17) and Bob Purket (37) participated in the 1961 World Series but neither of their uniform numbers are represented in this photograph which is further evidence. Also in looking at the field, it appears to be in great shape. There is no evidence of the field being burned out like it would probably be in October.
The players are Ken Johnson (40); Bill Henry (44); Jerry Lynch (24); Wally Post (29); Jim Brosnan (42); Vada Pinson (28); Frank Robinson (20); Gus Bell (25); Ken Hunt (41); Darrell Johnson (9); Jim Maloney (46); Sherman Jones (34); Leo Cardenas (16); Johnny Edwards (6); Jay Hook (47); Gordy Coleman (18); Pete Whisenant (27); Joey Jay (30); Eddie Kasko (10); Dick Gernert (15); Gene Freese (12); Jim O'Toole (31); and Don Blasingame (19).