Well, I did a WHOIS search to see who owns the website I mentioned above because it seemed to me something is not right. Why have a website with old ads? Turns out the website is registered in Russia, see:
Domain Name: CLASSICCARDB.COM
Registry Domain ID: 2032199339_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.reg.com
Registrar URL: http://www.reg.ru
Updated Date: 2018-04-02T20:26:48Z
Creation Date: 2016-05-29T20:20:04Z
Registry Expiry Date: 2019-05-29T20:20:04Z
Registrar: REGISTRAR OF DOMAIN NAMES REG.RU LLC
Registrar IANA ID: 1606
Registrar Abuse Contact Email: abuse@reg.ru
Registrar Abuse Contact Phone: +74955801111
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS1.X5X.RU
Name Server: NS2.X5X.RU
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2019-01-06T06:17:40Z <<<
Purpose of the website I think is not to scam buyers out of money (at least not directly) but rather to get buyers personal info (name, email address, telephone number), which they ask for when you send a message from their website to the "seller" about the car.