bikini 19
You should be able to find it from, this website's homepage. Put the full serial number into the TAIL NUMBER search box. (see example pix below) Should bring it right up.
Don't use the serial number search box. That box is for oem msn or c/n's only.
Your chopper 68-16478 has as c/n (or OEM serial # 11137)...
Hope This helps...
BTW
found some other info about your bird here:
http://www.48ahc.org/html/6816478.htm
http://www.48ahc.org/html/tail.htm
This airframe is listed as written off on: 08 FEB 1972.. Sorry no other details.
Regards
John