Hey there, having that bass-drum-tom bracket on the bass shell is not enough to date your drum except to say it is between 68-74. What you need is the tom mount arm itself. The cylinder shaped tom arm was made from 69-71 and then was switched for a rounded design from 72-75. After 75 we start to see the pipe tom arms that remain in use today.

[IMG]http://i302.photobucket.com/albums/nn87/Osakabop/ScreenShot2013-02-11at84833PM_zpsd7ec53f5.png[/IMG]

Cool, mine is the 68/69 tom arm.

One of your best (if not THE best resource) on these will be Mikey777 who resides right up the road from you in O.C. I highly suggest you take a road-trip up there to meet with him and look at some really cool stuff if he can carve out time for a visit. He's a really nice guy and a wealth of knowledge.

John