I have an Antique Flexible Flyer Sled my step mother’s parents bought for her and her siblings forever ago in North Dakota, and would love to know the value. It’s in great shape, though most the red painted picture on the sled boards themselves is almost faded beyond reading. I can still make out Rocket Racer, and on the back it’s simply marked RR 60. I’ve learned this was part of the airplane edition, the longer 60”models. I just have no clue what it’s worth. All original parts are on it, but the rope came off last year. Can anyone help place it’s age and value?