Our Classic Era item table (the Blizzard item records our Auction House scanner has collected) has 23 other shield off hand items between item level 1 and 11; 0 of them carry fixed stats.
Blizzard numbers items as they are created, so the named items next to ID 2129 (2123 to 2138) were usually added in the same batch as Large Round Shield: the same quest line, zone, vendor or reward set.
Connected realms with a listing in the latest Classic Era scan: EU 0 of 26, US 0 of 23.
Item data: Blizzard's Classic Era Game Data API (static data 1.15.9.68185). Prices: per-unit buyouts from Auction House scans made in game by players with the TheWoWDB addon, one scan per realm per hour at most; Blizzard publishes no auction data for Classic Era, so a price is only as fresh as the latest scan. Retail column: the retail client datamine.
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