Rim weights measured from on an Escali Primo kitchen gram scale.  Some
rims were held together in pairs with cellophane and twisty-ties so I
subtracted 10gm from these measurements to correct for the extra
weight.

Size  Type      Cond.  Model                                  weight   Notes

27"   Straight  Used   Weinmann 256 alesa / Birmalux dimpled  540 gm   = (1089 - 10)/2 (cellophane + twisty ties)
27"   Straight  NOS    Weinmann 220 non-dimpled alesa         610 gm   incl. yellow rim strip
27"   Straight  NOS    Weinmann 220 non-dimpled alesa         563 gm   = (1136 - 10)/2 (cellophane + twisty ties)
27"   Hooked    NOS    Weinmann 219                           535 gm
27"   Hooked    NOS    Weinmann RM19 (=219)                   539 gm   modern version of 219?
27"   Hooked    NOS    Super Champion Gentleman 81            480 gm   average of 481, 478

27"   Straight  -      Araya ales Weinmann-Copy non-dimpled   640 gm   published weight from lore & memory, stock on 1974 P-15
27"   Sun       -      M13 II                                 480 gm   published weight on weight weenies

Other misc rims i took down (the 27" rims should be 1.2% heavier)

700c  Hooked    Used   Nashbar/Rigida single-eyelet           524 gm   only have 1 of these, from a $60 wheelset in 1990.
700c  Hooked    NOS    Campagnolo Lambda                      408 gm   = (825 - 10)/2 (cellophane + twisty ties)
700c  Hooked    NOS    TREK Matrix Titan heat-treated         480 gm   dark grey & bends FOREVER at the 1st sign of a pothole ...