This slide-ruler with obstetric calculator and measurement conversion tables. Don't miss your chance to get this rare piece for your own or as a unique gift for someone special.

⭐ADVERTISER:  The Slyd-Rul Co..
⭐SERVICE/PRODUCT: Slide-rule measurements conversion.
⭐BEST GUESS ERA:  1946.
⭐CONDITION: Very good+; has light use and age patina, no blemishes. Review images for condition accuracy and verification. 
⭐WHERE I GOT IT: From a family member's collection collected during the mid-1980s to mid-2000s via auctions, flea markets, dealer shops and shows throughout Florida and Maine. It has not changed owners for the last 20 to 40 years.
⭐ADDITIONAL INFO: I have over 100 different antique and collectible advertising rulers I’m in the process of listing. Check 'em out!
★ Everything sold as-is. It is authentic vintage pre-owned. Read description and examine images thoroughly, they are of the actual piece. If the description has incorrect or missing information, polite input is encouraged.

🚚 Shipping Info 📦
Fast response and secure packing guaranteed. All orders are meticulously packed and shipped same or next USPS business day. Shipping is free for multi-orders in excess of $35. Domestic shipping is thru USPS and sometimes FedEx. Requests for shipping upgrade provided at cost. USPS has become unreliable, if your order is delayed, contact me for help. 
★ INTERNATIONAL SHIPPING independently provided by eBay.

🌟 Customer Service & Support 🌟
Satisfaction guaranteed. If an issue arises, priority is given to achieve a quick resolution. I try to meet or exceed customer expectations. If your experience is anything less, please tell me how I can improve; nothing is too small. Response is friendly with genuine concern to answer questions accurately and resolve issues quickly. Contact me for anything. Leaving 5-star positive feedback is the best way to express your appreciation.