Are any of these servers what you are looking for?

Servers with "Classic" and "Casual" in the name:
BwAGaming.Com CS:GO #2 - Classic Casual
Schlachtfest! -Classic Casual- Tick 128 - by www.aibr.de
Cause4alarm.net - Classic Casual
[NL] Onlydutch.com #3 CS: Global Offensive [Classic Casual]
24/7 [*XXL-Classic Casual-*] // xxlgamers.net
Gangpeng CS:GO Classic-Casual 2
csgo.nanus-ag.de | classic casual
*=[DGT]=* Nutten und Blackjack CS:GO-CLASSIC_CASUAL
Pz.D Gaming | CLASSIC CASUAL
TTK-DV CS:GO | Classic Casual