This is the Rapido OO Scale GWR Dia. O19 Open C Tube Wagon No.94835 [964003].

No.94835
O19 ‘Open C’
GW grey with 25″ letters
Flat door
Separately fitted tie-down hoops
Spoked wheels running in metal bearings
High level of detail above and below the floor line
NEM coupler pockets
1:76 scale, (OO gauge)
UK designed

SKU    964003
Scale    OO Gauge
Type    Wagons
Company    GWR
Era    Grouping Pre 36 (1923 - 1936)
Theme    Mainline