This appears to be a conventionally fueled version, though most of the designs for the Model 23 I've seen were nuclear powered.
http://cgi.ebay.com/CONVAIR-SAN-DIE...ryZ86954QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Note: not my model.
http://cgi.ebay.com/CONVAIR-SAN-DIE...ryZ86954QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Note: not my model.