Is this a full size or 3/4 size machine? BTW - Eldredge merged with June in the late 1800's and became National. National continued to use the name "Eldredge" up until they went out of business. So it's most likely you have a National badged Eldredge.
First you need to identify what model you have, you can post a picture and see if anyone knows, or you can go to Needlebar's photo gallery and look at the different National models and find one that looks similar - but ignore names and decals - they often aren't useful to identify models.
This is my National hand crank - badged Eldredge D
