From my Samples, Singulars, and Somethings Completely Different collection -
Circa 1670 - lightweight steel rotella with buckler-style central grips instead of the usual forearm and hand straps. This rare style is illustrated in "The Second Part of Fencing Illustrated" by Giuseppe Pallavicini (- with a big helmet tip to Christopher Holzman for the translation and identification!). It is 20 gauge mild steel with a reinforced rim and a solid hand grip, light enough to be wielded alongside and against the long rapiers of the time (and for good use in SCA and HEMA rapier sparring - not recommended for heavier thwacking). Painted flat black inside and out for durability.
weight: 3 lb 11.5 oz