My father recently passed away and has this sign hanging in the garage. I was wondering if anyone had any info on it. Bottom has I.R.R. 48 printed on it so I'm guessing that means it was made in 1948? It's double sided and pretty large. I'm guessing about 5-6 feet tall. Any info you can provide would be greatly appreciated as far as rarity, what it's made of, or when it was made. Thanks.