Dont you worry with OD7 colour. If the buckle is made out webbed light alloy it's a genuine WWII period. If buckle is made ou brass 99% it's a korean era. Very few M1923 ctg belts from WWII show brass buckle.
BTW the inner strap is used to separate '03 five rounds strip avoiding one will fall to the ground when you pick up thr other. It's unuseful with garand clip.